GB1303510A - - Google Patents
Info
- Publication number
- GB1303510A GB1303510A GB2708670A GB2708670A GB1303510A GB 1303510 A GB1303510 A GB 1303510A GB 2708670 A GB2708670 A GB 2708670A GB 2708670 A GB2708670 A GB 2708670A GB 1303510 A GB1303510 A GB 1303510A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- locally
- navigation
- june
- generated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/14—Determining absolute distances from a plurality of spaced points of known location
Abstract
1303510 Radio navigation COMPAGNIE GENERALE DE GEOPHYSIQUE 4 June 1970 [4 June 1969] 27086/70 Heading H4D A radio navigation system comprises transmitters Fig. la, 1b emitting on frequencies F A , F B , respectively wherein F A =F+f 1 , F B = F+f 2 (f 1 and f 2 being relatively low frequencies) and a receiver, Fig. 2, generating locally (frequency synthesizer 11) signals on f 1 , f 2 , means receiving and heterodyning the received signals (on F A , F B ) with a locally-generated H.F. signal to obtain the f 1 , f 2 navigation signals (mixers 3, 5), and means comparing the phases of the navigation and locally-generated f 1 , f 2 signals to give receiver position; equiphase curves are circles. Oscillators G A , G B are atomic to give high-stability e.g. 1 part in 10<SP>11</SP>; and in an example F = 2 MHz, f 1 = 80Hz, f 2 = 200Hz. There may be a third transmitting station. To eliminate ambiguity there are transmitted additionally, and simultaneously or sequentially F A <SP>1</SP>=F<SP>1</SP>+f 1 from A and F B <SP>1</SP>=F<SP>1</SP>+f 2 from B. and &c.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR6918336A FR2049232A5 (en) | 1969-06-04 | 1969-06-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1303510A true GB1303510A (en) | 1973-01-17 |
Family
ID=9035117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2708670A Expired GB1303510A (en) | 1969-06-04 | 1970-06-04 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3696427A (en) |
| AU (1) | AU447002B2 (en) |
| CA (1) | CA944048A (en) |
| FR (1) | FR2049232A5 (en) |
| GB (1) | GB1303510A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1493732A (en) * | 1975-07-24 | 1977-11-30 | Standard Telephones Cables Ltd | Radio direction finding equipment |
| US4283726A (en) * | 1978-09-05 | 1981-08-11 | Lewis C. Spence | Dual frequency distance measuring system |
| US4286270A (en) * | 1979-05-07 | 1981-08-25 | Veselkov Alex A | Double-channel satellite navigation system |
| EP0086189A4 (en) * | 1981-08-07 | 1984-03-27 | Lewis C Spence | Continuous wave carrier signals distance measuring system and method. |
| US4675684A (en) * | 1983-10-20 | 1987-06-23 | John P. Ohl | Distance measuring receiver system and method |
| US6968737B2 (en) * | 1997-01-02 | 2005-11-29 | Lucent Technologies Inc. | Position determining system using transmitted position information |
| AU1415902A (en) * | 2000-11-15 | 2002-05-27 | Racetrace Inc | Tag tracking |
| US7024331B2 (en) * | 2000-11-15 | 2006-04-04 | Scientific Generics Limited | Tag tracking |
| WO2003016940A2 (en) * | 2001-08-14 | 2003-02-27 | Scientific Generics Limited | Tag tracking |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2248727A (en) * | 1939-12-09 | 1941-07-08 | Howard M Strobel | Signaling system |
| US3150372A (en) * | 1959-06-23 | 1964-09-22 | Motorola Inc | Computing system |
| DE1252277B (en) * | 1963-08-19 |
-
1969
- 1969-06-04 FR FR6918336A patent/FR2049232A5/fr not_active Expired
-
1970
- 1970-06-01 CA CA084,203A patent/CA944048A/en not_active Expired
- 1970-06-02 US US42810A patent/US3696427A/en not_active Expired - Lifetime
- 1970-06-03 AU AU15866/70A patent/AU447002B2/en not_active Expired
- 1970-06-04 GB GB2708670A patent/GB1303510A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CA944048A (en) | 1974-03-19 |
| AU447002B2 (en) | 1974-03-21 |
| DE2027572A1 (en) | 1971-01-14 |
| US3696427A (en) | 1972-10-03 |
| FR2049232A5 (en) | 1971-03-26 |
| DE2027572B2 (en) | 1973-01-04 |
| AU1586670A (en) | 1971-12-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |